/*
 * %W% %E%
 *
 * Copyright 1997, 1998 Sun Microsystems, Inc. All Rights Reserved.
 *
 * Redistribution and use in source and binary forms, with or
 * without modification, are permitted provided that the following
 * conditions are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistribution in binary form must reproduce the above
 *   copyright notice, this list of conditions and the following
 *   disclaimer in the documentation and/or other materials
 *   provided with the distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY
 * DAMAGES OR LIABILITIES SUFFERED BY LICENSEE AS A RESULT OF OR
 * RELATING TO USE, MODIFICATION OR DISTRIBUTION OF THIS SOFTWARE OR
 * ITS DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE
 * FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT,
 * SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER
 * CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF
 * THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS
 * BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that this software is not designed, licensed or
 * intended for use in the design, construction, operation or
 * maintenance of any nuclear facility.
 */
package edu.unc.its.tl.bb;


import java.awt.Component;
import java.awt.event.*;
import java.awt.AWTEvent;

import javax.swing.*;
import javax.swing.event.*;

import java.util.EventObject;

import java.io.Serializable;

import javax.swing.CellEditor;

/**
 * @version %I% %G%
 *
 * A base class for CellEditors, providing default implementations for all
 * methods in the CellEditor interface and support for managing a series
 * of listeners.
 *
 * @author Philip Milne
 */
public class

AbstractCellEditor implements CellEditor {

   protected EventListenerList listenerList = new EventListenerList();

   public Object getCellEditorValue() {
      return null;
   }

   public boolean isCellEditable(EventObject e) {
      return true;
   }

   public boolean shouldSelectCell(EventObject anEvent) {
      return false;
   }

   public boolean stopCellEditing() {
      return true;
   }

   public void cancelCellEditing() {
   }

   public void addCellEditorListener(CellEditorListener l) {
      listenerList.add(CellEditorListener.class, l);
   }

   public void removeCellEditorListener(CellEditorListener l) {
      listenerList.remove(CellEditorListener.class, l);
   }

   /**
     * Notify all listeners that have registered interest for
     * notification on this event type.
     * @see EventListenerList
     */
   protected void fireEditingStopped() {
      // Guaranteed to return a non-null array
      Object[] listeners = listenerList.getListenerList();
      // Process the listeners last to first, notifying
      // those that are interested in this event
      for (int i = listeners.length - 2; i >= 0; i -= 2) {
         if (listeners[i] == CellEditorListener.class) {
            ((CellEditorListener)listeners[i +
             1]).editingStopped(new ChangeEvent(this));
         }
      }
   }

   /**
     * Notify all listeners that have registered interest for
     * notification on this event type.
     * @see EventListenerList
     */
   protected void fireEditingCanceled() {
      // Guaranteed to return a non-null array
      Object[] listeners = listenerList.getListenerList();
      // Process the listeners last to first, notifying
      // those that are interested in this event
      for (int i = listeners.length - 2; i >= 0; i -= 2) {
         if (listeners[i] == CellEditorListener.class) {
            ((CellEditorListener)listeners[i +
             1]).editingCanceled(new ChangeEvent(this));
         }
      }
   }
}

